Bell ringing device



Se t. 26, 1933. F. R. PLAGENS BELL RINGING DEVICE Filed July 14, 1930 JNVENTORI Patented Sept. 26, 1933 UNETED STATE-S r 1,927,901 BELL RINGING DEVICE Friedrich Richard Plagens, Berlin-Pankow,

- Germany Application July 14, 1930, Serial No. 467,827,

and in Germany May i, 1929 Claims. (Cl. 177--288) The invention relates to a bell-ringing device, driven by means of an electric motor, of the type in which, on the one hand, the working current is cut on by one or more automatic 5 switching devices before the end of each swinging out movement of the bell and, on the other hand, the turning back of the motor shaft is effected or started from the hell by its return movement. It is characterized by the feature that the switching device comprises twofriction members one of which is coupled to the motor shaft while the other is carried by a swinging contact so as to be engaged by the first friction member for temporarily moving its contact into engagement with a fixed contact during the movement of the bell.

The subject matter of the invention possesse inter alia, the advantagethat it pulls the bell as gently as if it were pulled by thehuman-hand and swings it up gradually and causes the contact parts to close with certainty and to open without any appreciable sparking, an'dthat it affords the possibility of easy adjustment in relation to the bell. s

The invention is illustrated by way of example by the accompanying drawing of which Fig. 1 shows a side View ofthe whole device;

Fig. 2 shows a front view; I

Fig. 3 an enlarged section through thependulum arm; I

Fig. 4 is a diagram of connections;

Fig. 5 shows a plant witha reversing and two rope pulleys; and.

Fig. 6 is a diagrammatic representation of a.

detail.

1 isa bell which hangs on a shaft 2 that carries a rope pulley 3. The latterv is connected by an endless transmission. member, formed by a'rope 4 and a chain 5, with the chain wheel 6 on a shaft '7, on which is fixed a toothed wheel 8 that is inengagement witha pinion 9 of an electric motor 10. The'pa'rts 6, '7 and 8 form a reduction gear which is carried by a box 11 that supports the motor 10.

On one side of the box there is located a switching dvice for the working current, this switching device being driven at a greatly reduced speed by the shaft 7, chain 12 and chain wheel 13. The switching device consists of a rotation shaft 15, journalled at 14, upon which a cam segment 16 is adjustably fixed. The latter serves as part of a friction gear completed by an exchangeable cheek 17 which works axially in a pendulum arm 18 loosely, mounted on the rotation shaft 15. The cheek is acted upon by a spring 19 and.

motor tion of the de-e'nergized motor. The turning its movement'in the direction of the .cam'l'fi is limited by astop 20. The free end of the. arm has a contact pin 22 which is connected to the conductor 21 and, onmaking contact withthe counter-contact 23, closes-the circuit of theeohductors 21 and 2 1. 25 denotes a stop that lirn v its the rearward'movement. of the arm 13. im parted thereto by a spring 261 27 isabr'anch' of the conductor 21 provided with a hand-switch 2 8 for starting the device. f 4 5 The device works, as follows:' i v In Figs. land 2 the individuallpa'rts of the installation are in the position of rest. For starting up, .the switch 28 is closed so that current passes, by way of conductor 27, into the motor,, 70.. which runs in the direction "indicated'by the arrow in Fig. 2, and the bell in moved to, the: left. At the sametimefthe friction cam,16 and friction cheek l'lproduce the. a'.'ct1iation\of the. pendulum arm 18 the contact 22 offwhich afterj75 a time comes into contact withthe counter-con: tact 23, so that the motor, even on the switch. 28 being opened, in the meantime, receives cure. rent untilthe cam 16 passes off the cheek .17;

In this instant, thearm 18 runs back-into its 0 initial position underthe actionof the spring," 26. The result of the disturbance of the sup: Ply of current produced in this 'wayis .that' the motor no longer'accele'rates jthe bellwhich,

' in accordance with the small movement impulse it has received, soon stops and swingsback'findoing which it 'changesflthe,[directionof rotaback of the motor shaft 7 causes the cam 16 to run on to the cheek 17. and .to travel' thereon in addition through a distance which corresponds to the. ,rnovement of the bellgthat is swinging back, from. the middle position to the right. On the resumed reversed movement of the bell, theldirection of'rotation of the rnotor.

,is again change (1.."-Shortly after, the contact 22 that is moved bytheiriction gear 16,"1"7,"closesj the circuit which now remains closed for a longer period, so that the bell again swings out. The greater return distance now again represents a longer friction path between the cam 16 and the cheek 17, thus producing a greater driving impulse. This action is continued until the bell has attained its usual stroke, whereupon the condition of continuance sets in.

It may be seen from the mode of operation that the motor begins to develop its power when the bell has completed its reversed movement and that it ceases to deliver power when the bell swings out. Owing to the adjustable arrange- 110.

ment of the cam 16, one is in a position to rapidly adjust the switching device, sothat the ringing device can be adapted without trouble to the prevailing circumstances.

29 represents a weight which is used for balancing the braking action of the motor and which is provided in the vertically arranged pulley rope 4, 5. In order to make the drive of the bell as gentle as possible, the chain wheel 6 is operatively connected with the shaft 7 by means of a yielding bodye. g., by means of a spring 30;

For bell-driving gears with a motor pinion directly connected by a pulley rope with the bellrope pulley, it is proposed to provide a readily exchangeable lining in the rope groove for rapidly altering the diameter of the rope pulley. In

such driving gears, the switching device is arranged on' the side of the motor, so that the whole apparatus becomes, owing to the omission of the box, especially simple and advantageous.

According to Fig. 5 the invention is extended to the following efiect:-In conjunction with a reversing motor 31, two pendulum arms are provided preferably on a common rotation axle 15 and are placed in relation to each other to correspond to the strokeof the bell for the purpose of driving the bell after each reversal of movement. This arrangement is especially suitable for small bells the masses of which are not sufficiently great to cause them, on being subjected 'to only a one-sided drive, to swing sufficiently far to the other side.

In such installations it is also advisable to use two pulley ropes between the motor and the bell, and to insert a spring element 32 at one side of one rope and at the opposite side of the other rope.

The tight sides part of the rope gears will serve the purpose of transmitting the movement of the chain wheel 6 to the rope pulley 3 without slipping, whilst the loose sides with the inserted spring 32 will prevent undesirable great tensions occurring between the shafts 2 and 7.

By adjusting the stop 25, the travel of the contact 22, and consequently the distance through which the bell must travel before it is accelerated by the motor, can be regulated. The acceleration of the bell by the motor only after its self-acceleration savescurrent and preserves the whole installation. When demanded by the nature of the current, two movable contacts 22 are arranged which co-operate with corresponding counter-contacts 23.

I claim: V g

1. An'electric bell-ringing device of the character described, comprising an el'ectro-motor, a,

gearingconnectingsaid motor with the bell, a switching device for said motor comprising a fixed contact and aswinging contact, means tend- "ing to maintain said contacts open, a friction member on said swinging contact, a shaft oper- 'a pair of circuits for supplying current to and reversing the motor, a switch in each circuit, each switch comprising a fixed contact and a swinging contact, a friction member on each swinging contact, means tending to maintain said contacts open, a shaft coupled to the motor, and a friction member mounted on said shaft for each swinging contact in position to engage the friction member of the latter and hold the contacts temporarily together. i

4. In a bell ringing device, a bell, means for oscillatably mounting said bell, an electric motor, drive means between said motor and said bell for oscillating the latter, an electric circuit for said motor including a switch having co-operating contacts, movable means having one of said contacts thereon and causing said contacts to engage when in one position and maintainingsaid contacts disengaged in a second position, said movable means having a bearing surface, means normallyurging the movable means into said second position, drive means having a cooperating bearing surface, connecting means between said motor and the said drive means for moving the latter in proportion to the movement of the bell, and means for frictional engagement of said bearing surfaces for portions of the movement of the said drive means whereby said movable means is moved to first position.

5. In a bell ringing device,-a bell, means for 115 oscillatably mounting said bell, an electric motor, drive means between said motor to said bell, an electric circuit 'for'said motorincluding a switch having two co-operating contacts, a member having one of said contacts thereon, and 120 adapted in one position to engage said contacts and in a second position to maintain said contacts disengaged, means for movably mounting said member, means normally urging said member into said second position, a segmental member having a bearing surface, means for oscillatably mounting the last named member, drive means between said motor'and the lastnamed" member, and an element on said first member, having a bearing surface, means tending to maintain said bearing surfaces frictionally engaged and means for adjusting the relative positions of said bearing surfaces whenthe bell-is in still position.

. l FRIEDRI HRICHARD PLAGENS. 

